Bicycle



FIG. 1 is a right side elevational view of a bicycle showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a rear elevational view thereof.

The broken lines in the drawing are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a bicycle, as shown and described. 